Hi Brianna, you are a very kind and caring owner!
Let me reassure you that it was right for you to separate Mr.E from the girls! Rabbits as young as 10 weeks of age can be sexually mature.
Rabbits in the wild live solitary lives and only 'get together' to breed. The Mother Rabbit only stays around her babies to feed them, clean them and distract predators from her nest. She does NOT form lasting relationships with them (like a Mother Dog would do with her puppies).
You should be sure to observe the female cage closely for any signs of fighting or food guarding so that everyone stays happy and healthy...separate the females if you have any doubt that they are getting along.
To be a good bunny owner you should be sure to visit the hutches every day (at least twice daily) to check the security of the enclosure, to verify that the rabbits are healthy, and to resupply their food and water. If you are having trouble keeping up with this size of a group, you should consider re-homing a few of the bunnies.
Some school teachers can provide excellent care to a rabbit as a classroom pet (which they take home during the summer months to keep as a house pet), pet stores will often sell your offspring (they usually do not pay you), or a local veterinarian may allow you to post a notice that the pets are available (make sure your poster says you are selling the rabbits as pets...not snake food! Ask a reasonable price so that you are sure the new owner will feel responsible for giving proper care).
***It is extremely likely that any new rabbit put into Mr.E's cage will be the subject of a great deal of aggression. If you want to reduce his anxiety from not mating any more, you may be able to find a veterinarian who can neuter him...surgically removing his testicles will help reduce the amount of testosterone in his system and make him less interested in females.
Give him as much kindly attention as you can, but know that he will prefer to NOT share his cage with another animal.
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Your concern has touched me--if you have follow-up questions, or need to clarify your case, please let me know right away! Your "Accept" helps me reach out to others!

